// Captain Proto -- Protobuf Object-capability RPC
// Copyright (c) 2009 Kenton Varda, Google Inc., and contributors
// http://capnproto.googlecode.com
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of the Captain Proto project nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

package capnproto;

import java.util.List;

/**
 * Extracts services embedded in an RPC message.
 *
 * See {@link RpcContext} for more information.
 */
public interface ServiceReceiver {
  /**
   * Gets a channel connected to the service associated with the given ID.
   *
   * The ID number should be the one returned by {@link ServiceSender#send}
   * on the sending side.  Normally the ID should be sent as part of the RPC's
   * protocol message.
   *
   * Call YourServiceType.fromChannel(channel) to construct an instance
   * of YourServiceType from the channel.
   */
  Channel receive(int id);

  /**
   * Receives all of the services embedded in the RPC message.  The returned
   * list is indexed by ID.
   */
  List<Channel> receiveAll();
}
